One of the examples of bad design Donald Norman discusses in his seminal book The Design of Everday Objects is the door with a handle and a sign saying Push.  If the door is meant to be pushed it should have a plate instead of a handle.  A plate gives the affordance of pushing whilst a handle gives the affordance of pulling.  Hence the need for a Push sign if the door has a handle instead of a plate.
I was reminded of this in the Lori's Diner next to the King George Hotel.  Its entrance door swings both ways.  Each side of the door has a handle and a Push sign.  I still can't quite decide whether that's design genius or design imbecility.
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